Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The fairy tale castle of the "fairy-tale king."

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

This massive blockhead sculpture hides an entire library.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Guests become prisoners on a visit to Latvian prison.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

Spend the night in 1920s Latvia in this historic recreation and movie set.

3,000 market stands in five former Zeppelin hangars.

Flamboyant architecture from the turn of 20th century.

A black cat protests the City Guild in Riga's Old Town.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Artists and musicians now rule over this former rail station.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Eighty million natural history specimens call this gargantuan museum home.

Giant, friendly pelicans in Central London, the most unlikely of places.

Catacombs turned marketplace.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.